External monitor on a laptop with intel 945GM graphics

Vedran Rodic vrodic at gmail.com
Tue May 15 16:23:11 PDT 2007


I have a Thinkpad X60 laptop that has Intel 945GM graphics controller. The
native resolution of the LCD display of the laptop is 1024x768.

I want to use an external CRT monitor with 1280x1024 at 85 HZ. I made this
work on the included Windows XP easily, but I'm unable to set it up on
Linux. I'm using the Debian unstable with xrandr 1.2 and intel driver 2.0.
Running 'xrandr' returns:

VGA connected 1024x768+0+0 (normal left inverted right) 0mm x 0mm
   1280x800       60.0

   1280x768       60.0
   1024x768       60.0*
   800x600        60.3
   640x480        59.9
LVDS connected 1024x768+0+0 (normal left inverted right) 246mm x 185mm
   1024x768       50.0*+   60.0     59.9     40.0
   800x600        60.3
   640x480        60.0     59.9
TV disconnected (normal left inverted right)

I tried with latest xorg server and intel driver from git just in case, but
the git version is only different so that xrandr doesn't return modes
1280x800 and 1280x768. I've tried customizing the xorg.conf file to make
xorg only use the CRT, but it crashed. The xorg.log of that session is

I guess that the bios returning the resolution 1024x768 is what is confusing
the driver.

Ideally, I should be able to attach the monitor while xorg is running, xorg
should read the edid data off the monitor and xrand should present me with a
wide range of modes available for that monitor. I guess were not there yet
for my particular configuration, but I'm ready to help in any way.
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